Resizable, collapsible, nested, DIV-based split panels for ASP.NET applications. Horizontal/Vertical split. Multiple fixed-size/auto-fill panels in a container. Constraints on panel sizes: min/max/step sizes. Live refresh while resizing. Appearances and behaviors of the splitters and panels can be flexibly customized. Works with MS ASP.NET AJAX. Supports all major browsers, and quirks/strict modes. Highly useful as a generic page layout tool.